@misc{indiciaecd0c32ef0b61,
  title = {Geologic map of the Frogue quadrangle, Kentucky-Tennessee},
  author = {Richard Quintin Lewis},
  year = {1967},
  doi = {10.3133/gq675},
  url = {https://pubs.usgs.gov/publication/gq675},
  note = {Source identifier: gq675}
}